Diminishing Milk Glass

Magician display Four clear transparent glasses of different sizes. Each glass is approximately double as large as the previous one. Magician fills the smallest glass with some milk. When the contents of the smallest glass are poured into the next bigger glass that is twice as big as the smallest one, it is found to have filled up. The milk has magically doubled itself. Magician is able to double the milk twice more. Stunning!
Reverse routine can also works nice, where you start with the biggest glass and keep diminishing the milk till it fits into the smallest glass, this effect is simply mind blowing!!.